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Last week’s Western Disturbance as a cyclonic circulation over East Afghanistan & adjoining Pakistan moved eastwards through the Western Himalayan Region and caused isolated light rain/snow over Jammu & Kashmir on 18th.
Last week’s cyclonic circulation over Lakshadweep and neighboring areas moved westwards and caused fairly widespread light rainfall over Lakshadweep and isolated rainfall over Kerala.
A trough of low at mean sea level laid over the Malay Peninsula and adjoining south Andaman Sea moved westwards and caused fairy widespread rainfall over Andaman & Nicobar Islands on many days of the week.
A fresh Western disturbance as an upper air cyclonic circulation over western parts of Iran and neighboring areas moved eastwards and induced a cyclonic circulation over central Pakistan & neighboring areas and then moved northeastwards and caused rain/snow at many places over the Western Himalayan region and the plains of Northwest India received rainfall at a few places - one or two places between 0830 hours IST of 23rd to 0830 hours IST of 24th January 2018.
Fog and Cold WaveFOGDense to very dense fog was observed at many places over Bihar, East Uttar Pradesh, and at isolated places over Punjab, Haryana, Chandigarh & Delhi, Assam & Meghalaya, Nagaland, Manipur, Mizoram & Tripura, Sub-Himalayan West Bengal & Sikkim on many days of the week and on a few days of the week over West Rajasthan and western Uttar Pradesh.
Cold wave/severe cold wave conditions prevailed at isolated places over Haryana, Punjab, Bihar and Telangana on many days of the week; on one/two days of the week over Uttarakhand, Rajasthan, Odisha, Gangetic West Bengal, Madhya Pradesh and Jammu & Kashmir.
During the week, the lowest minimum temperature of 2.1°C was recorded at Muzaffarnagar (Western Uttar Pradesh) in the plains of the country.
Cold day/Severe cold day conditions prevailed at a few places on many days of the week in Eastern Uttar Pradesh, Bihar, and over isolated places on one/two days of the week over Western Uttar Pradesh, Haryana, Punjab and Gangetic West Bengal.
During the week the lowest maximum temperature of 13.0°C was recorded at Bahraich (Eastern Uttar Pradesh) in the plains of the country.
Ground Frost conditions prevailed at isolated places over Haryana and Punjab on a few days of the week.

The cumulative rainfall Sub-Division wise for the week (18-24 January 2018) predicted by IMD GFS model shows that Andaman & Nicobar Islands, western Uttar Pradesh, Haryana, Chandigarh & Delhi, Rajasthan would receive excess rainfall, whereas Andaman & Nicobar Islands, Uttarakhand, Haryana Chandigarh & Delhi and Punjab received excess rainfall. Other Sub-Divisions had a prediction for excess rainfall but received normal/largely deficient rainfall. The normal rainfall that was predicted was for the Sub-divisions of Uttarakhand, Punjab, Himachal Pradesh, Saurashtra, Kutch & Diu, Konkan & Goa, Rayalaseema and Coastal Karnataka. However, only Uttarakhand and Punjab received excess rainfall. Himachal Pradesh received deficient rainfall and other Sub-Divisions have not received any rainfall. Deficient/Largely Deficient rainfall was predicted for the Sub-Divisions of Eastern Uttar Pradesh, Jammu & Kashmir, Madhya Pradesh, Tamil Nadu & Puducherry, South Interior Karnataka, Kerala and Lakshadweep. The only rightly predicted Sub-Divisions are Jammu & Kashmir, Eastern Uttar Pradesh, Kerala and Lakshadweep and the other Sub-Divisions have not received any rainfall. In areas with no rainfall predicted, only Arunachal Pradesh received Largely Deficient Rainfall. Overall Model has predicted well for 20 out of 36 Sub-Divisions of the country.

During the week, rainfall over the country as a whole was 73 per cent below the long period average (LPA). Andaman & Nicobar Islands, Uttarakhand, Haryana, Chandigarh & Delhi and Punjab received excess rainfall, western Rajasthan received normal rainfall and Western Uttar Pradesh, Himachal Pradesh and Lakshadweep received deficient rainfall. All the other Sub-divisions either received largely deficient/ no rainfall. Details of the rainfall distribution over the four broad homogeneous regions of India are given below:

For the country as a whole, cumulative rainfall was (-84 per cent) of LPA as on 24th January 2018.Cumulative rainfall was deficient over the Southern Peninsula and Northeast India. Rainfall was excess over Andaman & Nicobar Islands; normal over Nagaland, Manipur, Mizoram & Tripura; deficient over Assam & Meghalaya & Tamil Nadu & Puducherry. The other Sub-divisions received largely deficient/ no rainfall over the rest of the Sub-divisions of the country. Details of rainfall distribution over the four broad homogeneous regions of India are given below:

Rainfall activity will be normal over Nicobar Islands and near normal over Western Himalayan Region. Overall activity over the country will be below normal. Light to moderate rainfall/snowfall will occur over the Western Himalayan Region due to western disturbance which will affect from the night of 28th January 2018.